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Each carbon has a molecular weight of 12. Since glucose has 6 carbons, 12 multiples by 6 equals 72 grams per mole. Each hydrogen is approximately 1, which contributes another 12 grams per mole. Each oxygen is 16, so 16 multiplies by 6 gives 96 grams per mole. The sum of 72, 12 and 96 is 180. Sugars containing 6 carbons, such as glucose, galactose and fructose, are collectively referred to as hexoses.